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drm/i915/dsi: transmit brightness command in HS state

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In Video Mode, if DSI transcoder is set to transmit packets
in LP Escape mode, screen flickering would be obseved when
brightness commands are continuously and quickly transmitted
to a panel.

The problem may be resolved by changing the mode to transmit
packets from Low Power to HS.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Lee Shawn C <shawn.c.lee@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Signed-off-by: William Tseng <william.tseng@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211110010217.26759-1-william.tseng@intel.com
This commit is contained in:
William Tseng 2021-11-10 09:02:17 +08:00 committed by Jani Nikula
parent f35294e13c
commit d1260be706
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c
View file

@ -71,6 +71,7 @@ static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32
u8 data[2] = {};
enum port port;
size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
unsigned long mode_flags;
if (len == 1) {
data[0] = level;
@ -81,8 +82,11 @@ static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32
for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
dsi_device = intel_dsi->dsi_hosts[port]->device;
mode_flags = dsi_device->mode_flags;
dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
&data, len);
dsi_device->mode_flags = mode_flags;
}
}